The architecture-related build tags in the upstream code were
replaced with a simpler tag for pointer size. This ensures the
package will build on any Debian architecture.

The drawback is that packages using this code now have to set
the tag also. Please use something like this in your rules:

DEB_HOST_ARCH_BITS ?= $(shell dpkg-architecture -qDEB_HOST_ARCH_BITS)
POINTER_SIZE_TAG = "$(DEB_HOST_ARCH_BITS)bit_pointer"

override_dh_auto_build:
	dh_auto_build -- -tags $(POINTER_SIZE_TAG)